End Frustrating Shifting Problems in Your GM Truck
If you’re dealing with a transmission that seems to have a mind of its own—slamming into gear, refusing to shift, or putting your truck into a frustrating limp mode—you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM vehicles, especially workhorses like the Sierra 2500, come into the bay with these exact symptoms. More often than not, the culprit isn’t a catastrophic internal failure, but a faulty Transmission Control Module (TCM). This VIN-programmed T42 TCM, part number 24241806, is the definitive solution to restore the crisp, reliable shifting your truck had from the factory.
Case Study: A Tricky Diagnosis
A customer brought in his 2007 Sierra 2500 with the 6.0L engine, complaining of intermittent harsh 1-2 shifts and a persistent Check Engine Light. The scan tool showed a generic P0700 (Transmission Control System Malfunction) code. While this can point to many things, my experience with these T42 modules immediately made the TCM a prime suspect. We could have spent hours chasing potential solenoid issues, but the intermittent nature of the fault strongly suggested an electronic failure. After installing one of our pre-programmed modules, the shifting smoothed out instantly, and the P0700 code never returned. It saved the customer hundreds in diagnostic fees and prevented a potential misdiagnosis of a much more expensive internal transmission problem.
Is Your Sierra Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Watch out for these early warning signs that point directly to the module. Addressing them with a new 2007 Sierra 2500 Transmission Control Module can prevent further damage.
- âś” Harsh, jerky, or delayed gear shifts that disrupt your drive.
- âś” The vehicle gets stuck in one gear (often 2nd or 3rd), a condition known as “limp mode.”
- âś” An illuminated Check Engine Light or Transmission Warning Light, often with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related codes.
- âś” Complete failure to upshift or downshift, leading to poor acceleration and performance.
- âś” A noticeable drop in fuel economy as the transmission operates inefficiently.
- âś” Unexplained communication errors with the transmission when using a diagnostic scan tool.
A Straightforward Guide to Installation
One of the best features of this part is its simple, DIY-friendly installation. Because we program it to your vehicle’s VIN before shipping, you can skip the expensive trip to the dealership for programming. You can get your truck back to perfect working order in your own driveway in under 30 minutes.
- Safety First: Always disconnect the negative terminal on your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s electronic systems.
- Locate the Module: On your 2007 Sierra 2500, the TCM is conveniently located in the engine bay, right next to the battery.
- Perform the Swap: Carefully unplug the electrical connectors from the old module. Unbolt it from its mounting bracket and set it aside. Bolt the new module in its place and securely reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. While the system may reset on its own, it’s best practice to use a standard OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Will This Fit My Truck?
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. Please verify your model and specific options below to ensure compatibility. This part is interchangeable with service numbers 24252114, 24234503, 24241806, and others.
This part will fit these makes and models with these options:
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
… and many other GM models from 2006-2014 including Tahoe, Suburban, Express, Savana, Yukon, H3, and more.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean for me?
It means the module arrives ready for installation. We load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before it ships. This ensures it communicates perfectly with your truck’s engine computer and other systems, eliminating the need for a dealership to perform a costly programming service.
Can I install this 2007 Sierra 2500 Transmission Control Module myself?
Absolutely. This is a popular repair for DIY mechanics. The module is typically located next to the battery, making it easily accessible. With basic hand tools and our installation guide, most people can complete the job in under 30 minutes.
Will this part fix a P0700 or P0750 trouble code?
Yes, in many cases. A P0700 is a general code indicating a fault in the transmission control system, and codes like P0750 (Shift Solenoid ‘A’ Malfunction) are frequently caused by a failing TCM rather than the solenoid itself. Replacing a faulty TCM is a very common and effective fix for these codes.
Is there a core charge? Do I need to send my old part back?
No, there is no core charge for this module. You can keep your old part, saving you the time and hassle of packaging and returning it.